I see, you're calling java directly from the command-line by calling the java command. The exe launchers don't correctly detect Java 9 yet, so if you use the normal Windows install it won't work.

Note for anyone reading this thread:

If you want (experimental) High DPI support you need to install Java 9, download the FileBot portable package and then run filebot.cmd otherwise it won't work (and complain about Java 8 not being installed).

This is wonderful! I only just now spotted this post and checked my Filebot. Up to now, I have been having to use my old desktop whenever I wanted to use Filebot but I have just checked my 4K laptop and it looks great now. It must have been updated by the Store and I didn't notice. Am I right that Filebot is now v4.8.1.0 and Java is 10? There doesn't seem to an About menu option but the directory name includes that version number. The Java version is mentioned in the 'release' file in the jre directory. I am using W10 64bit.

Yes I use significant display scaling, often 150-200%
PS I think you might have improved things since I left this, as looking at it compared to this shot, the icons appear bigger. Maybe MS changed something?